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The Sun is in sidereal Gemini from June 15, 2026 to July 16, 2026 in 2026 by the Lahiri ayanamsa. This places the sidereal Gemini window squarely in the period when tropical Cancer is opening — a clear illustration of how a 24.21° ayanamsa separates the two zodiac systems.
Tropical Gemini spans May 21 to June 20, anchored to the ecliptic geometry of the equinox. Sidereal Gemini spans a different stretch of sky — the band containing the bright twin stars Castor and Pollux, the Geminids’ radiant, and the ecliptic crossing of the Milky Way. The two zodiacs aligned around 285 CE; since then, Earth’s axial precession has shifted them apart at 50.3 arcseconds per year, or roughly 1° every 72 years. By 2026 the gap stands at approximately 24.21°, quantified by the Lahiri ayanamsa. The result: the Sun physically transits the Gemini star band starting in mid-June, not late May. Astronomers confirm this; tropical Gemini dates are an artifact of the equinox definition, not a map of actual sky positions.
Why sidereal differs from tropical →
The Lahiri ayanamsa grows at 50.3 arcseconds per year, moving the sidereal Gemini ingress by about 20 minutes per decade. This is negligible for most purposes — the Gemini entry date stays near June 15 across the entire span of years covered by the Swiss Ephemeris (5400 BCE to 5400 CE). The exceptions: people born on June 14–16 in any year, where the sign boundary crosses the birth date, should check the year-specific ingress time to confirm whether their Sun is in sidereal Taurus or Gemini. The table below provides exact UTC entry and exit times for 2023–2029.
| Year | Sun enters | Sun exits |
|---|---|---|
| 2023 | June 15, 2023 | July 16, 2023 |
| 2024 | June 14, 2024 | July 16, 2024 |
| 2025 | June 15, 2025 | July 16, 2025 |
| 2026 | June 15, 2026 | July 16, 2026 |
| 2027 | June 15, 2027 | July 17, 2027 |
| 2028 | June 14, 2028 | July 16, 2028 |
| 2029 | June 15, 2029 | July 16, 2029 |
Enter your birth date to find which sidereal sign the Sun was in.
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